Thaddaeus sits next to 4 phonetic neighbors — Theodore, Tobias, and Matthias are the closest matches by sound. Most share Thaddaeus's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"heart, courageous heart"
"desired, longed for"
"one million million (10^12)"
"appointed by God"
"people of warmth"
"manly, brave one of God"
"olive warrior"
"well-pleasing, excellent"
"devoted to Demeter"
"virtuous, without wickedness"
"eastern Saxon territory"
"edge of a shield"
"place on a riverbank"
"from the castle town"
"cheerful, merry"
"smooth, clear water"
"at the barns, near the granary"
"God strengthens"
"who is like God"
"lord of waters"
"bold undertaking; risky journey"
Similar sound: These names share phonetic patterns with Thaddaeus — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Aramaic origins, giving them the same cultural heritage as Thaddaeus.
Rhythm: Thaddaeus is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.